What is Sumatra PDF?
Sumatra PDF is a free PDF, XPS, DjVu, CBZ and CBR reader for Windows.
Sumatra PDF is small and starts up very fast.
Simplicity of the user interface has a high priority.
Portable version included (a single executable that can be run e.g. from USB drive and doesn’t write to registry).
3.6 (2026-03-17)
add DisableAntiAlias advanced setting and CmdToggleAntiAlias command
add CmdShowAnnotations, CmdHideAnnotations, CmdToggleShowAnnotations commands for temporarily hiding / showing annotations
add CmdToggleInverseSearch to temporarily disable mouse click invoking tex inverse search
add bgcolor, opacity, textsize, borderWidth arguments to CmdCreateAnnot* commands
add Annotations.FreeTextBackgroundColor and Annotations.FreeTextOpacity advanced settings
sort thumbnails on home page by most recently used date. Set advanced setting HomePageSortByFrequentlyRead = true to revert to pre-3.6 behavior of sorting by frequency of use.
support brotli compression in PDF files
in Command Palette, if you start search with : we show everything (like in 3.5)
in Command Palette, when viewing opened files history (#), you can press Delete to remove the entry from history
improved zooming:
zooming with pinch touch screen gesture or with ctrl + scroll wheel now zooms around the mouse position and does continuous zoom levels. Used to zoom around top-left corner and progress fixed zoom levels shown in menu
include manual (F1 to launch browser with documentation)
add LazyLoading advanced setting, defaults to true. When restoring a session lazy loading delays loading a file until its tab is selected. Makes SumatraPDF startup faster.
new commands in command palette (Ctrl + K):
CmdCloseAllTabs : “Close All Tabs”
CmdCloseTabsToTheLeft : “Close Tabs To The Left”
CmdDeleteFile: “Delete File”
CmdToggleFrequentlyRead : “Toggle Frequently Read”
CmdToggleLinks : “Toggle Show Links”
CmdInvokeInverseSearch
CmdMoveTabRight (Ctrl + Shift + PageUp), CmdMoveTabLeft (Ctrl + Shift + PageDown) to move tabs left / right, like in Chrome
add ability to provide arguments to some commands when creating bindings in Shortcuts:
CmdCreateAnnot* commands take a color argument, openedit to automatically open edit annotations window when creating an annotation, copytoclipboard to copy selection to clipboard and setcontent to set contents of annotation to selection
CmdScrollDown, CmdScrollUp : integer argument, how many lines to scroll
CmdGoToNextPage, CmdGoToPrevPage : integer argument, how many pages to advance
CmdNextTabSmart, CmdPrevTabSmart (Smart Tab Switch), shortcut: Ctrl + Tab, Ctrl + Shift + Tab
added UIFontSize advanced setting
removed TreeFontWeightOffset advanced setting
increase number of thumbnails on home page from 10 => 30
add ShowLinks advanced setting and “Toggle Show Links” (CmdToggleLinks) for command palette
default ReuseInstance setting to true
added Key arg to ExternalViewers advanced setting (keyboard shortcut)
added Key arg to SelectionHandlers advanced setting (keyboard shortcut)
improved scrolling with mouse wheel and touch gestures
theming improvements
go back to opening settings file with default .txt editor (notepad most likely)
don’t exit fullscreen on double-click. must double-click in upper-right corner
when opening via double-click, if Ctrl is pressed will always open in new tab (vs. activating existing tab)
register for handling .webp files
bug fix: Del should not delete an annotation if editing content
bug fix: re-enable tree view full row select
change: CmdCreateAnnotHighlight etc. no longer copies selection to clipboard by default. To get that behavior back, you can use copytoclipboard argument instead.
change: Ctrl + Tab is now CmdNextTabSmart, was CmdNextTab. Ctrl + Shift + Tab is now CmdPrevTabSmart, was CmdPrevTab. You can re-bind it if you prefer old behavior
CmdCommandPalette takes optional mode argument: @ for tab selection, # for selecting from file history and > for commands.
command palette no longer shows combined tabs/file history/commands. CmdCommandPalette only shows commands. Because of that removed CmdCommandPaletteNoFiles because now `CmdCommandPalette behaves like it
removed CmdCommandPaletteOnlyTabs, replaced by CmdCommandPaletteNoFiles @
Ctrl + Shift + K no longer active, use Ctrl + K. You can restore this shortcut by binding it to CmdCommandPalette > command.
add Name field for shortcuts. If given, the command will show up in Command Palette (Ctrl + K)
closing a current tab now behaves like in Chrome: selects next tab (to the right). We used to select previously active tab, but that’s unpredictable and we prefer to align SumatraPDF behavior with other popular apps.
swapped key bindings: i is now CmdTogglePageInfo, I is CmdInvertColors. Several people were confused by accidentally typing i to invert colors, is less likely to type it accidentally
allow creating custom themes in advanced settings in Themes section. See docs.
improve scrolling with middle click drag #4529
make built-in keyboard shortcuts work on non-us keyboards (cyrillic , hebrew etc.)
add CmdDuplicateInNewTab (Open Current Document In New Tab) command
